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1418881285399-WDG-3A (ENGLISH).Pdf Lesson No. 1 HEAT ENGINE Heat engine - Heat engine is the machine which converts heat energy into mechanical energy. Heat engine are of two types. a. External combustion engine - In External combustion engine fuel is burnt or ignited outside the engine cylinder. So it is called as external combustion engine e.g. Steam engine. b. Internal combustion engine - In internal combustion engine fuel is burnt or ignited inside the engine cylinder so it is called internal combustion engine e.g. Petrol engine, diesel engine. They are of two types a. Spark ignition engine - In this type of engine fuel is injected along with air in the cylinder and after compression this mixture is given electric spark due to which fuel starts burning and produces power. e.g. Petrol engine b. Compression ignition engine - It is an engine in which the fuel is ignited in to charge of compressed air and ignited spontaneously by the high temperature of the air induced by the heat of compression. e.g. Diesel engine. Combustion - Burning of fuel with air is called combustion. Piston stroke - The movement of piston from top dead centre to bottom dead center is called the piston stroke. Dead centre - The place beyond which the piston cannot move further in a cylinder is called dead center. Top dead centre - The end towards the head of the cylinder is called top dead center. Bottom dead centre - The end towards the base of the cylinder is called top dead center. Total Volume - The area between piston and cylinder head when the piston is at BDC is called total volume. Swept Volume – When the piston travel during one stroke then the area covered by it, is called swept volume. Clearance Volume – The area above piston when it is at TDC is called Clearance Volume. DIESEL LOCO NOTES/ZRTI/BSL ® 1 Compression ratio - The ratio of total volume and clearance volume is called compression ratio. Compression Ratio = Total volume Clearance Volume Total volume = Swept volume + clearance Volume Diesel cycle - In the compression ignition engine to convert heat energy into mechanical energy the following actions takes place in fixed sequence, when this action is completed once is called Diesel cycle. a) Suction – In this atmospheric air enters in to the cylinder. b) Compression - The air inside the cylinder is compressed with the help of piston due to which pressure increases resulting in rise in temperature. c) Fuel injection - Injection of fuel in atomized form at right time when air is at high temperature. d) Power - When fuel burns inside the cylinder the heat energy is discharged leads piston to move downwards. e) Exhaust – The gasses produced in cylinder is exhausted to atmosphere. Depending upon the cycle diesel engine is classified into two types. 1) Two stroke Engine - In this engine one cycle is completed by two piston strokes. All four actions (Suction, compression, power and Exhaust) are completed in one revolution ( 360 0 ) of the crankshaft In this cycle piston starts from BDC and every downward stroke is power stroke, to complete one stroke the crankshaft rotates 90 0 only. a) Suction - when piston is at BDC fresh air or mixture (petrol and air) is admitted into the cylinder from ports specially provided in cylinder liner. b) Compression - when piston travel in upward and cover the ports, compression starts and completes when piston reaches TDC. c) Power - When the piston reaches TDC at this time fuel is injected into the cylinder in atomized form, exhaust gases are produce and push the piston downwards. In this stroke piston travels from TDC to BDC. d) Exhaust - When piston travel half distance during downward stroke either exhaust valve or exhaust port open and exhaust gases goes out. This stroke completes when piston reaches BDC. 2) Four stroke Engine - In this type of engine the cycle completes in two revolution of the crankshaft (720 0) a) Suction stroke - In this stroke piston moves from TDC to BDC during this time inlet valve is open and exhaust valve remains closed and the air from the V gallery enters into the cylinder through inlet valve. DIESEL LOCO NOTES/ZRTI/BSL ® 2 b) Compression stroke - In this stroke the piston moves from BDC to TDC both inlet and exhaust valve will remains close. Air in the cylinder is compressed due to which the temperature and pressure increases. Before the piston reaches at TDC the fuel is injected into the cylinder through injector in atomization form, fuel starts burning. c) Power stroke - when the fuel burnt gases is created this tends the piston move from TDC to BDC. In this stroke both exhaust and inlet valve close. Before reaching to the BDC, Exhaust valve opens. d) Exhaust stroke - In this stroke piston travels from BDC to TDC this time inlet valve remains closed but exhaust valves are opened and gases goes out. Scavenging : It means kick out the residual exhaust gasses from cylinder with the help of fresh charge air. It is essential in super charged engine that the cylinder be adequately scavenged before the fresh air charge is compressed otherwise such charge is contaminated by the residual exhaust gases from the previous cycle. Different between two stroke and four stroke engine Two stroke Four stroke The cycle of operation is completed The cycle of operation is in 2 stroke of the piston i.e. one completed in four stroke of piston revolution of the crankshaft i.e. in two revolution of crankshaft Every revolution of crankshaft have One power stroke is obtained into power stroke two revolution of crankshaft. Lube oil consumption rate is high. Lube oil consumption rate is low. Engine working capacity is less. Engine working capacity is more. Two strokes are noisier and wear & It makes less noise and wear & tear is more. tear. It is light in weight. It is heavy in weight Compression ratio is less. Compression ratio is more Thermal efficiency of engine is less. Thermal efficiency of engine is more. It requires less space. It requires more space. Ports are available on cylinder liner. Ports are not available on cylinder liner. Less vibration. More vibration. Its design is simple Its design is complicated. DIESEL LOCO NOTES/ZRTI/BSL ® 3 Lesson No. 2 POWER PACK Specialty of WDG/3A loco engine 1. 251-B Up rated type 2. ‘V’ type cylinder arrangement 3. Total 16 cylinder 4. Four stroke cycle 5. Single acting 6. High speed 7. Water cooled 8. Force lubricated 9. Super charged 10. Quality governor 11. Solid injection fuel supply Main parts of engine block 1. Cylinder blocks 2. Main crank shaft 3. Cylinder liner 4. Piston rings & connecting rod 5. Camshaft & camshaft gear 6. Push rod 7. Main Bearing 8. Cylinder liners 9. Cylinder head & valve 10. Piston rings & connecting rod 11. Fly wheel 12. Rocker arm assembly 13. ‘V’ gallery 14. Vibration damper 15. Exhaust manifold Description In WDG-3A locomotive 251-B up rated engine is fitted. Cylinder block of these engine posses by sixteen cylinders, eight on each side (left and right) and arranged in “V” shape. This cylinder block is made of steel plates welded together and mounted on crankcase with the help of nuts and bolts. This cylinder block support main crank shaft and two cam shaft inside. Engine block having V gallery, it is called air intake manifold, each cylinder is connected to manifold with the help of inlet elbows. Each cylinder has a cylinder liner, piston and connecting rod, cylinder head with two inlet and exhaust valves, one fuel injector and rocker arm assembly. In engine block a main crank shaft made up of steel alloy is fitted in one piece. It has 9 main bearings and 8 crank pins. On every crank pin two connecting rods are connected, the other end of connected rod is connected with Piston with the help of piston pin. Fly wheel is fitted on one end of the main crank shaft and vibration damper on the other end. On fly wheel end main generator is connected, this end is called power take off end and opposite end is called free end. Two cam shafts are provided in engine block on both sides, each shaft has made of four pieces and each piece has two pairs of three lobes. Camshaft is driven by its gear (104 teeth) matching with split gear (52 teeth). Split DIESEL LOCO NOTES/ZRTI/BSL ® 4 gear is provided on main crank shaft at power take off end. In 3 cam lobes, left side cam operate inlet valves, right side cam operate exhaust valves and middle cam operates fuel injection pump. Each cylinder has a piston which is made of Aluminum with steel cap, piston has two ends, top end is called piston crown and bottom end is piston body. Piston body has three compression rings and two oil scraper rings. Piston is connected to connecting rod with piston pin. Oil grooves are provided to cool the piston with lube oil. Cylinder liner made of cast iron is fitted in each cylinder. Honey combings are provided on the inside surface of the liner for lubrication purpose. Liner is covered with water externally, ‘O’ ring is provided in between liner and cylinder block to avoid water leakage. In each cylinder head two inlet valve, two exhaust valve, one fuel injector and rocker arm assembly is fitted. Cylinder head kept cool with water. Cylinder head is covered with Tapped cover. Inlet valve is connected to “V” gallery through inlet elbows. Exhaust valve is connected to exhaust manifold through exhaust elbows. Rocker arm assembly operates inlet and exhaust valve. Inlet valve, exhaust valve and fuel injection pumps are operated according to their valve timing.
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